The Horizon — Douglas Reeman

Three generations of Blackwoods have served the Royal Marines with distinction. Now it is the turn of young Jonathan Blackwood to take up arms. In 1915, he fights from the sea, supported by the Royal Navy in the battlefields of the Dardanelles and Gallipoli, helpless to save either himself or his men. Two years later in Flandrs, Blackwood finds that Hell can get worse as he and his men fight on the horrific Western Front.