Use "observation post" in a sentence

1. The U.S. Navy set up an observation post for the duration of World War II.

2. It was as if God’s chariotlike heavenly organization moved to an observation post above the Mount of Olives.

3. But, the Balana rock fortress that served as an observation post stood against an invasion of the Kandyan kingdom

4. At 0520 hours on 26 Rajab A.H. 1436 (15 May A.D. 2015), a mortar shell fired by members of the Houthi terrorist group fell on the Manarah observation post, some 750 metres from the border.