What bolt hole used for in trenches?

What are soldiers not accounted for? What did America do to anger the Japanese? What role did unrestricted submarine warfare have on the us during world war 1? The importance of gallipoli in world war 1? Was the Battle of Midway the first navy battle carried out completely by aircraft? Where did the anzacs fight in WW1? Who said sepoy mutiny is the first war of independence? What was a famous battle that Eisenhower won? Description of a war like scene? Why was Lincoln decision to send supplies to fort Sumter difficult to make? Why did German U-boats sink unarmed Allied ships such as Lusitania? How much is a 5 cent military bill worth? What policy says that a nation secludes itself from other nations and avoids forming alliances with them? The most alarming aspect of the Compromise of 1850 to northerners was the decision concerning? Why did the Lend-Lease Act refer to promoting the Defense of the US as its goal when the aid was intended for other countries? In August of 1939 Germany and which country signed a nonaggression pact that meant they would not attack each other? How did World War 2 changed the role of women in society? What was army commander John Bell Hood's plan of action at the Battle of Nashville? What countries fought on both sides during WW1? What would the final score be if a team is down by one and has a player hit a ground rule double in the bottom of the ninth with the bases loaded?