Siege warfare is something we are planning, with siege units and walls, but we have no ETA for this yet. It's interesting that you post this though, because community requests, comments, analytics, videos etc. are the only way for us to know how people play the game. This is the first time we've hard about resource camps being used to create walls. This makes the feature feel more urgent to us, definitely!
Have you tried upgrading Heavy Spearman armour to counter the Bowman and take down the Watchtowers?
Apperantly my friend spent the whole game just fortifying. My whole army died to his bowman spam even though my attack infantry was made out of swordsman. i will try out heavy spearmen and its armour counter next time i play thank you for the suggestion. I think i shouldn't let the enemy fortify and attack before he is able to defend, maybe thats my mistake. I was using houses as walls but i noticed resource camps were cheaper and stronger than houses. Maybe that could use a tweak? I will also try out recording the game for better example.