We must take over this fortress before the suset. The key difference is that a castle is designed for the nobility class comprising of dynastic rulers and kings while a fort is built for. C'est plus fort que nous!@ooaclouds c'est plus fort que nous = nous n'avons pas pu nous en empêcher 的定义
They both are in a sense strong for military purposes.的同义词 Fort 1.堡垒:一个设防的地方或驻扎有军队的地方 2.要塞:一永久军事驻地 fortress can be used alone. It's sometimes temporary, doesn't necessarily have strong fortifications and can often be outside cities.
Fortboth castle and fort are medieval fortified buildings. Fort they're kinda the same thing, but a fort tends to be a building whereas a fortress can be many buildings or a city.