Watch The Trench (1999) HD Full Movie Free on SolarMovie. Watch The Trench (1999) online free. June 1916. The British Army is planning a big offensive in the Somme region in France. We follow a p...June 1916. The British Army is planning a big offensive in the Somme region in France. We follow a platoon of British soldiers as they sit in a forward trench, anxiously awaiting the order to go over the top.