bastion

noun
1
a group of people or a system that protects a way of life or a belief when it seems that it may disappear
سنگر, دژ, حامی, مدافع
2
a place that military forces are defending
دژ, سنگر, قلعه, حصار, برج و بارو, برج دفاعی, پایگاه, مرکز دفاعی, موضع دفاعی, سنگرگاه
Singapore was the last bastion of British defences in South-East Asia.