Ambassador vs Rooster

Battle Report ID:1165160 | Occurrence time: 2010-04-18 12:28:03- 进攻方 - > Ambassador[3:267] [英雄]Fëanor(20 级): Alive [Common]Swordsmen: 3000 - 150 = 2850 [Ranged]Riflemen: 2000 - 0 = 2000 [Magic]Wizard: 1000 - 0 = 1000 [Castle Attacker]Steam Tank: 500 - 0 = 500 [Common]Axemen: 500 - 0 = 500 [Ranged]Hawkmen: 500 - 0 = 500 [Magic]Wizard Killer: 500 - 0 = 500 [Magic]Panther Knights: 400 - 0 = 400 [Logistics]Coolies: 1000 - 0 = 1000- 掠夺资源 -- 防守势力 - > Rooster[439:199] [英雄]Nike(11 级): Dead [Defense]Trap: 5 - 5 = 0 [Defense]Sentry Tower: 2 - 2 = 0 [Defense]Archers Tower: 2 - 2 = 0 [Common]Chaos Units: 1000 - 1000 = 0 [Castle Attacker]Soul Cannon: 458 - 458 = 0 [Common]God's Warrior: 41 - 41 = 0 [Non-attacker]Laborers: 100 - 100 = 0 [Logistics]Coolies: 200 - 200 = 0 [Logistics]Cart: 5 - 5 = 0 [Logistics]Giant Rats: 100 - 100 = 0 [Non-attacker]Spy: 7 - 7 = 0- 废墟&战争遗迹 - 战争遗迹: 形成(形成概率 31%)

Why did ambassador attacked Rooster anyway?