The letter

Back in world war 1 the letter was the only way to communicate to the people back home.  This could cause many problems and frustrations, such as the long process of the mail getting sent or the person could die but the person receiving the letter might believe they are still alive. The letter getting sent through the mail is a long and tedious process, it could take months back then to get a letter from the sender to the receiver.  Also in some cases the letter would get sent and the solider would die but the receiver would get it thinking the solider is still alive.