The road was constructed by excavating a wide, shallow trench below subsoil level. The tank was designed to break the deadlock of trench warfare. Artillery dominated the battlefields of trench warfare. The hand grenade came to be one of the primary infantry weapons of trench warfare. The fundamental purpose of the aircraft in trench warfare was reconnaissance and artillery observation. Extending southwest of this trench is the Macquarie Ridge. Chagos Trench, an underwater canyon plunging more than . The parados protected the soldier's back from shells falling behind the trench. I where it was a feature of trench warfare. Credits adapted from the liner notes of "Trench" and Tidal. The forearc lies between the trench and the volcanic arc. The result was four years of trench warfare. The German military searched for ways to apply this in the face of trench warfare. Below are schematics depicting the measurement process for trench structures. I trench knife, primarily to conserve strategic metal resources.