n.围攻者；围攻军
Sieges that aimed at isolating and reducing fortified places became the dominant instrument for prosecuting the war and protective fortifications were vital, for both the besieged as well as the besieger. 对于攻城战的双方来讲，以孤立并消耗筑垒地域为目的的攻城战成为战争的决定性手段、同时保护筑垒地域的防御工事也生死攸关。
