Which of these sentences are correct:

1-Soldiers timid and cowardly don't fight well. - I would not put adjectives after the noun they modify.

A. Soldiers that are timid and cowardly don't fight well.

2-A soldier came in the room, a soldier timid and cowardly. You don't need to say "a soldier" twice. Get rid of the second "soldier" and the comma. Reverse the word order.

B. A timid and cowardly soldier came into the room.

3-A soldier timid and cowardly came into the room. - I would rewrite this one in the same way I rewrote the number 2.

C. A timid and cowardly soldier came into the room.

4-They arrest soldiers timid and cowardly.

D. They arrest soldiers that are timid and cowardly.

5-They arrested a soldier timid and cowardly.

E. They arrested a timid and cowardly soldier.