In total, he took 12 cities. He had many notable kills including Hector, the Trojan prince. Achilles was in large part the reason the Greeks were able to pull out a win in that war. He was undefeated in battle and never came close to losing. When the tenth year of the war came, an altercation with a fellow Greek left Achilles out of the war for some time. His absence was felt greatly, and without him, the Greeks were losing a lot of ground. The Trojans were no longer afraid to fight because the most feared warrior was no longer on the opposing side. Following the resolution of his conflict, Achilles returned to the battlefield to completely ravage the opponents and win the war. Without him, the Greeks would have quickly lost the war