The German’s bolt-action rifle appears very briefly in the reveal trailer, but it’s inclusion is a no-brainer. It’s a standby rifle, and even appeared in the original Battlefield 1942 wielded by British infantry where the same basic model, with some improvements, continued service into WW2.
The Enfield is a bolt-action rifle that served in a multitude of countries both during and after the war. The British soldiers seen in this trailer trench scene are using what appears to be Enfield rifles with bayonets attached, preparing to defend their trench from an enemy charge. The rifle is very to the Gewehr 98 and should serve the same purpose. The standard American bolt-action service rifle will most likely be employed as a Sniper Rifle variant in Battlefield 1. All Bolt-Action rifles in Battlefield 1 appear to be Sniper Rifles.
Bolt-action rifles are reserved for Scouts, whereas semi-automatic rifles with magazines can be used by Medics. Single-shot and slow, these weapons still packed a punch. Rifles were the primary fighting weapon in WW1.