
As Austria, there are a few strategies to get a personal union with Bohemia. One way is to royal marry Bohemia and then claim their throne if a member of your dynasty is on the throne when the interregnum ends. Another strategy is to complete the Secure Electors mission, which requires being the Emperor of the HRE, having at least five of the HRE Electors voting for you, and having at least a +100 opinion from them. This involves allying with as many electors as possible, getting royal marriages with those that aren't theocracies, and improving relations. However, some players have noted that getting a PU over Bohemia can be challenging and may require multiple attempts.
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What You'll Learn

Marry Bohemia and claim the throne
One of the first missions in Austria's tree is "Secure Electors", which requires you to be the Emperor of the HRE, have at least five of the HRE Electors voting for you, and have at least a +100 opinion of you. You can ally with as many Electors as possible, get royal marriages with the ones that aren't theocracies, and improve relations with any of them who still need a higher opinion until the mission is fulfilled.
Another strategy is to marry Bohemia, ally with Brandenburg/Saxony, and then wait. As soon as they get your dynasty, rival them and declare war. You can also try to get Poland involved in a war until they get a king, as it prevents them from getting their union with Lithuania.
It's worth noting that some players have reported difficulties in getting a PU with Bohemia as Austria, with the game mechanics changing over time and the AI not always pursuing the PU even when the opportunity arises. Additionally, there can be significant diplomatic and relations penalties for enforcing a PU.
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Ally with electors and improve relations
To ally with electors and improve relations, you should focus on building strong diplomatic ties with the electors, who hold significant influence in the Holy Roman Empire. Start by identifying the electors, who are typically members of the electoral college that elects the ruler of the Holy Roman Empire. Aim to ally with as many electors as possible, excluding Bohemia.
One strategy is to pursue royal marriages with electors who are not theocracies. This can help solidify alliances and improve relations. Additionally, work on improving relations with electors through diplomatic means, such as bestowing imperial grace or even gifting. It is also important to maintain positive relations with the Emperor, as this can impact your standing with the electors.
Another approach is to focus on building military strength. This can be done by building infantry and investing in morale or discipline advisors. You can also try to wipe out Bohemia's army at the start, protecting your lands while sieging them. It is also beneficial to form alliances with nations such as Poland, who may rival Bohemia, to strengthen your position.
Additionally, keep an eye on the spread of Protestantism, as this can influence the Emperor's choices. If the Empire remains Catholic, the Emperor may be more inclined to grant elector titles to nations that share the same faith. However, if Protestantism spreads, the Emperor may be forced to grant elector titles to a wider range of nations to maintain stability.
Finally, consider the option of acquiring a personal union (PU) with an elector. By integrating them into your nation, you can gain influence and potentially secure an elector position for yourself. This strategy can be complex, but it demonstrates the importance of building strong relations with both electors and the Emperor.
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Get a restoration PU CB
Getting a Restoration Personal Union (PU) Casus Belli (CB) can be a tricky affair, especially when dealing with nations like Bohemia that have multiple allies. Here is a step-by-step guide on how to get a Restoration PU CB as Austria:
Identify your target nation and its allies:
In this case, your target nation is Bohemia, which has historically had strong alliances with Denmark and other smaller nations. It is important to assess the strength of these alliances and determine if they pose a significant threat to your plans.
Evaluate your own alliances:
As Austria, you may want to consider forming alliances with powerful nations that can aid you in your endeavour. In the example provided, Poland is mentioned as a potential ally, but their debt may be a hindrance. It is crucial to weigh the pros and cons of potential allies and decide if they will be beneficial to your cause.
Choose your Casus Belli wisely:
The Restoration of Union CB is a powerful tool that allows you to pursue a personal union with your target nation. However, it is important to note that this CB may not always be the best option. In some cases, a Conquest CB or other alternatives might be more suitable, especially if you are concerned about generating excessive aggressive expansion (AE).
Plan your war strategy:
Consider the number of provinces you will need to occupy to achieve your goals. In the case of Bohemia, you may need to occupy specific provinces to core Pilsen and also achieve the PU. Assess your military strength and decide if you can occupy all the necessary provinces, especially if your target nation and its allies have strong defensive capabilities.
Declare war and enforce your demands:
Once you have declared war with the Restoration of Union CB, you will need to occupy the required provinces and enforce the personal union in the peace deal. This will cost 60% warscore, so ensure that you have generated enough warscore through military action and other means.
Manage the aftermath:
As mentioned in the provided example, enforcing a personal union can be draining in terms of manpower and may lead to coalitions forming against you. Be prepared to deal with any potential fallout and work on stabilizing your nation after the war.
In summary, getting a Restoration PU CB requires careful planning, strategic alliances, and an understanding of the potential challenges and consequences. By following these steps, you can increase your chances of successfully achieving a personal union with your target nation.
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Rival Bohemia and declare war
Another strategy is to improve relations with five electors and then declare war on Bohemia. This can be done by allying with as many electors as possible (except Bohemia), getting royal marriages with the ones that aren't theocracies, and improving relations with any electors who still need a higher opinion. This strategy can also be used to get a PU on Bohemia as Austria.
It is important to note that, when declaring war on Bohemia, it is crucial to be able to wipe out their first 10k stack. The challenge comes when they split up and start sieging your lands, recruiting huge numbers in the process. To counter this, it is recommended to have two stacks of 10k-14k troops in the north but not on the border with Bohemia. Once you have fulfilled the mission requirements, move your troops to the border and, when they arrive, take the mission and declare war. This way, their eastern fort won't be garrisoned, and you can siege out any allies they call in.
Additionally, it is beneficial to have Poland as an ally when going to war with Bohemia, as they often rival each other. However, it can take a long time to get the required number of points to ally with Poland. To speed up this process, get an advisor with diplomatic reputation at the start of the game.
Finally, it is worth noting that, in older versions of the game, it was possible to get a PU on Bohemia as Austria by simply royal marrying them and then claiming their throne. However, this strategy no longer works, as Bohemia will flip straight to Podebrad.
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Get an alliance with Poland
To get an alliance with Poland, it is essential to have them rival Bohemia. One player suggests getting an advisor with diplomatic reputation at the start to expedite the process of forming an alliance with Poland. This advisor can add five points towards Poland liking you more, which can be crucial in forming the alliance.
Another strategy is to focus on improving relations with electors. This can be done by allying with as many electors as possible, excluding Bohemia, and pursuing royal marriages with those that are not theocracies. It is also beneficial to improve relations with any electors who still need a higher opinion of you. Bestowing imperial grace and gifting can also help improve relations. By following this strategy, you can complete the Secure Electors mission, which is one of the first missions in Austria's tree.
Additionally, it is worth noting that having a royal marriage with Bohemia and then claiming their throne if you get a member of your dynasty when the interregnum ends can be a quicker approach. However, this method does not always work, and you will have to take a hit to stability for declaring on someone you have a royal marriage with.
Overall, forming an alliance with Poland requires a combination of diplomatic reputation, strategic alliances, and improving relations with electors to either complete the "Secure Electors" mission or pursue the royal marriage and throne-claiming strategy with Bohemia.
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Frequently asked questions
One way is to complete the "'Secure Electors' mission", which requires you to be the Emperor of the HRE, have at least five of the HRE Electors voting for you, and have at least a +100 opinion of you. You can also try to royal marry Bohemia and then claim their throne if you get a member of your dynasty when the interregnum ends.
Ally with as many of the Electors as possible (except Bohemia), get Royal Marriages with the ones that aren't theocracies, and improve relations with any of them who still need higher opinions until the mission is fulfilled.
You can try to get an alliance with Poland right at the beginning by getting an advisor with diplomatic reputation. Then, you need Poland to rival Bohemia and get your dynasty for an easy PU. Another strategy is to ally with Brandenburg/Saxony, marry Bohemia, wait for them to get your dynasty, and then rival them and declare war.
You can try to tire out Bohemia's allies by sieging them and making sure their armies get wiped out. Alternatively, you can focus on wiping out Bohemia's army at the start and then sieging them with your other army.
Yes, one challenge is that Bohemia often rivals Austria, which can make forming alliances more difficult. Additionally, there is a risk that Bohemia will flip to Podebrad after a royal marriage, which can make it harder to claim their throne.

















