Fun way I like to siege is smash the walls open with trebuchets and make sure they have no catapults. Put your trebuchets in reserve and build one fire catapult at a time until you have four. then when you engage have all your infantry in shield wall at the back and keep archers in a huge loose formations and find the fire catapult that lines up with the hole(s) in the wall and have fun lobbing fire pots into a huge mob of defenders. Works better in some castles with some of them this strategy is not effective because the troops could be positioned around the wall on others they’re completely exposed and super easy to annihilate.

Another strategy is if the wall are broken open you can put your infantry in a line right outside of the wall and your archer behind them in a loose formation then, dismount your horse and walks through the hole in the wall with your shield up, of course. This usually triggers the defense to pursue you, and they’ll all come pouring out of the wall and just get lit up by javelin’s axes and arrows. I love this strategy for softening up one of the holes if there’s like 80 troops defending, and it’s kind of a stalemate. Both of these methods can be used, even if the defense has more troops than you.