Game concept
Siege Replenishment
From the game's encyclopedia
When an Adventurer successfully Sieges a Holding, a portion of their Men-at-Arms will be replenished.
All Men-at-Arms Regiments in the Army will be replenished by x2 times the Holding's Loot value.
The increase is made up of new recruits, the press-ganging of locals, and simply paying those who wandered off during the siege.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Siege Replenishment is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "When an Adventurer successfully Sieges a Holding, a portion of their Men-at-Arms will be replenished." It is part of Manually Reinforce. Patch 1.20.1.2, from game/common/game_concepts/07_ep3_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/07_ep3_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.