They had gunpowder, catapults, siege engines. A navy with the biggest ships in human history.
他们有火药，弹弓，攻城机，拥有人类历史上最大船只的海军。
Siege engine
原声例句
著名历史人物传记
冰与火之歌：列王的纷争（中英对照）
" You will make camp outside their walls and set to building catapults and siege engines" .
" 你只管在城外扎营就好，并着手修建投石机和攻城器。"
英语百科
Siege engine
A siege engine is a device that is designed to break or circumvent city walls and other fortifications in siege warfare. Some have been operated close to the fortifications, while others have been used to attack from a distance. From antiquity, siege engines were constructed largely of wood and tended to use mechanical advantage to fling stones and similar missiles. With the development of gunpowder and improved metallurgical techniques, siege engines became artillery. Collectively, siege engines or artillery together with the necessary troops and transport vehicles to conduct a siege are referred to as a siege-train.