Why was it hard to attack Troy?

Attacking Troy was challenging due to its formidable defensive walls, which were thick and high, making direct assaults difficult. The city was strategically located near the Dardanelles, allowing it to control vital trade routes and receive reinforcements. Additionally, the Trojans were well-prepared and skilled in warfare, further complicating any siege attempts. The combination of these factors made Troy a nearly impregnable fortress for the Greek forces during the Trojan War.