("Brooks") Citation for picture above ^
If you don't have a rifle I'm not sure why your even on a battle field. If you wanted to return fire on the enemy you would need a rifle. A rifle would also keep you and your fellow soldiers safe.
The final thing you would need to survive is a helmet. A helmet would protect you from the shrapnel of bullets. With out a helmet your head is completely exposed, some protection is better than none.
Work Cited
British Brodie Helmet. WarHats, 2017, www.warhats.com/ww1-british-brodie-helmet- fusiliers.html. Accessed 27 Mar. 2017.
Brooks, Ernst. Trenches of the 11th Cheshire Regiment at Ovillers-la-Boisselle,on the Somme. 1 July 1916. Wikipedia, 1 July 1916, en.wikipedia.org/wiki/Trench_warfare#/media/File:Cheshire_Regiment_trench_Somme_1916.jpg.Trench_warfare#/media/File:Cheshire_Regiment_trench_Somme_1916.jpg.Trench_warfare#/media/File:Cheshire_Regiment_trench_Somme_1916.jpg.
World War One Rifle. Armed Forces History Museum, 1 May 2012,armedforcesmuseum.com/top-military-weapons-of-wwi-and-wwii/. Accessed 24Mar. 2017.
World War One Trench shovel. Military Antiques and Museum, 2002-2017,militaryantiquesmuseum.com/wwi-british-items.34.html?row=30. Accessed 24Mar. 2017.