If you fight wars in Europa Universalis V, update 1.4 touches you. It does not touch some niche single-country system or a corner of the map most players ignore. It rebalances cavalry, the punchiest unit class in open battle, and it changes how every siege resolves. Both are core to nearly every campaign, which is exactly why these changes deserve their own guide rather than living only inside the general 1.4 hub article.

One important framing note up front. Everything here comes from Tinto Talks 118, posted July 29 2026, and it is all preview content for update 1.4. None of these values are live in the current build, and update 1.4 is not in open beta yet. Treat these as confirmed developer-diary numbers, not something you can test right now. The current versions of these mechanics are covered in the site’s EU5 combat guide and EU5 sieges guide, and this piece is specifically about what changes in 1.4.

The cavalry rebalance

Cavalry gets hit in three separate places, and together they add up to a genuine repositioning of the unit class.

Combat power drops from 4 to 3.25. That alone is roughly a 19% reduction in raw punch, and it matters for every cavalry stack on the field regardless of what bonuses you have layered on top.

Then the flanking bonus gets flattened hard. Previously, light cavalry flanked at +110% and heavy cavalry at +100%. In 1.4 both drop to a flat +60%. This is the most strategically significant cut in the update. Flanking is the mechanic that lets cavalry swing around and punish the edges of an enemy line, and the biggest single reduction falls on light cavalry, which loses more than half of its flanking bonus. Heavy cavalry also starts the update lower than it was, but proportionally it is the safer of the two.

The Napoleonic Warfare advance gets reworked too. It previously let cavalry ignore zones of control, which made it excellent at slipping behind enemy lines to cut supply lines and pounce on reinforcements. In 1.4 it instead grants +5% discipline. Discipline is a strong stat, and the advance is still worth taking on that basis alone, but the tactical job it does changes completely: you lose the behind-the-lines mobility trick and gain a flat combat quality boost instead.

For a fuller picture of how these numbers fit into the wider system, the site’s EU5 combat guide walks through the current mechanics in depth.

The siege changes: a stepping stone, not the end

Sieges get two changes, and both nudge them toward faster resolutions.

Artillery now needs only 2 regiments per bonus point against forts, down from 3. Practically, this means a besieging army reaches its artillery bonus with a smaller train, or pushes more bonus points with the same guns. Sieges should resolve somewhat faster and cost somewhat less in heavy-unit upkeep.

The surrender threshold also changes in kind, not just in number. Forts previously surrendered below 10 defenders, a flat count. In 1.4 the threshold becomes percentage-based: a fort auto-surrender below 5% of its garrison strength. That is a real difference in how the rule works, because a large, well-provisioned garrison now capitulates at a far higher absolute number of troops than a small one. Whatever the raw defender count, the fort gives up once it is reduced to a twentieth of its strength.

Here is the honest bit worth remembering. The developers explicitly describe these siege changes as a small stepping stone ahead of a larger, more comprehensive siege rework planned for a future update, 1.5. The changes above are the first touch, not the final word. If you go looking for the end state of EU5 sieges, the short answer is that it has not been designed yet.

For the current mechanic in full, the site’s EU5 sieges guide covers how forts and garrisons work today.

What it means for your next campaign

The practical takeaway is pretty direct. If your current strategy leans on a heavy cavalry flanking wing, 1.4 is going to make that noticeably weaker, and light cavalry flanking pays for most of the update’s bill. It is not a death sentence for the class, cavalry still hits hard and the +5% discipline path still rewards invested players, but the old expectation that a cavalry wing can win a battle by itself is squarely what Paradox is trimming.

Combine that with faster, cheaper sieges and the shape of 1.4 warfare is: lean on line infantry and artillery, stop expecting flanking alone to decide big battles, and get used to forts falling a little sooner than they used to. Adapting to that shape before the update lands is genuinely the winning move. Curious about the current mechanics before 1.4 arrives? Give them a trial run in the EU5 Army Battle Lab or the EU5 Siege Lab.