1. Troops were detailed to guard the frontiers. 
   军队被派遣去保卫边防。
2. The invaders were pushed back beyond their own frontiers. 
   入侵者被赶回自己的边境以内。
3. The garrison fought off the attackers. 
   驻军击退了袭击者。
4. The garrison was starved into surrender. 
   卫戍部队因遭到断粮而投降。
5. They performed meritorious deeds in the fight to defend the frontiers of the motherland. 
   在保卫祖国边疆的战斗中他们立了功。

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