peer pressure was a large impact of why men signed up for the war. it is scientifically proven that people tend to follow what there friends or people around them do. Lots of men are certain they want to go to the war and give that vibe off to people they know.
palls battalion- The British army had to form so many new battalions that they allowed people from the same towns and communities to join the same battalions. Called the "Pals Battalions." people thought, if my friends are going, i will too!
adventure - many of those who enlisted saw the war as achance to grab a bit of glory. When war was declared it was genuinely thought that it would be over pretty quickly, men joined thinking that if they delayed a decision that the war would be over and others would get the honour of having participated.
guilt - the white feather was quite scary in some aspects as the people who receive it feel guilty and think again about going to the war. It is a symbolism of asking yourself and is a trick again to try and force men to sign up even if no one is telling them to.
persuasive shows- sometimes famous footballers or people do shows to tell there fans to sign up for the war. since they naturally have lots of people who follow what they do or say, it encourages more people to sign up. this follows on to the government forcing famous people to put up shows for it so it helps them get more people to go to war.