Weird Question for a Long Time

Whenever I defend a town, let's say 200 defender against 1000 attackers. After defeating 300 of them, the rest of the 700 just become prisoners. This has never happened before when I first started playing. If the enemy retreates that just means get ready for an second attack. But for some reasons, whenever the enemy, even if they are 3x our size, after they retreat (let's say we killed about 1/4 of them) the remaining just gives up?? Even though they still outnumbers us and/or they could just walk away? Why are they turning themselves in?

Sure this works good in my favor but it kind of takes the fun out of a siege battle.

submitted by /u/Relevant_Sir_1582
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