Why was it hard for the crusades to capture the city?

The Crusades faced significant challenges in capturing cities due to strong local defenses, including fortified walls and experienced garrisons. Additionally, logistical issues such as supply shortages and the difficulty of coordinating large armies across long distances hindered their efforts. Internal divisions among the Crusaders and the resilience of the local populations further complicated their campaigns. These factors combined to make sieges prolonged and often unsuccessful.