2 sentences for 紮 (zhā)

1. 士兵们在山头安营扎寨。

   shì​bīng men zài shān​tóu ān​yíng zhā zhài.

   The soldiers set up camp on the hilltop.

   Source: Dong Chinese Dictionary

2. 为了守住入城口，军队在桥头扎了下来。

   wèi​le shǒu​zhu rù​chéng​kǒu, jūn​duì zài qiáo​tóu zhā le xià​lai.

   To guard the entrance to the city, the army set up camp at the bridgehead.

   Source: Dong Chinese Dictionary