B - 4 ▁was ▁armed ▁with ▁two ▁ ▁tor ped o es ▁in ▁two ▁bow ▁tor ped o ▁tub es . ▁She ▁was ▁also ▁out f itted ▁for ▁a ▁single ▁ ▁machine ▁gun ▁on ▁deck . ▁U B - 4 s ▁standard ▁complement ▁consisted ▁of ▁one ▁officer ▁and ▁th ir teen ▁en list ed ▁men . ▁ ▁After ▁work ▁on ▁U B - 4 ▁was ▁complete ▁at ▁the ▁Germ ani wer ft ▁yard , ▁U B - 4 ▁was ▁read ied ▁for ▁rail ▁ship ment . ▁The ▁process ▁of ▁sh ipping ▁a ▁U B ▁I ▁boat ▁involved ▁breaking ▁the ▁sub marine ▁down ▁into ▁what ▁was ▁essentially ▁a ▁knock ▁down ▁k it . ▁Each ▁boat ▁was ▁broken ▁into ▁approximately ▁fifteen ▁pieces ▁and ▁loaded ▁onto ▁eight ▁railway ▁flat c ars . ▁In ▁early ▁ 1 9 1 5 , ▁the ▁sections ▁of ▁U B - 4 ▁were ▁sh ipped ▁to ▁Ant werp ▁for ▁assembly ▁in ▁what ▁was ▁typically ▁a ▁two - ▁to ▁three - week ▁process . ▁After ▁U B - 4 ▁was ▁assemble d ▁and ▁launched ▁som etime ▁in ▁March , ▁she ▁was ▁loaded ▁on ▁a ▁bar ge ▁and ▁taken ▁through ▁can als ▁to ▁Bru ges ▁where ▁she ▁under w ent ▁tri als . ▁ ▁Service ▁career ▁ ▁The ▁sub marine ▁was ▁commission ed ▁into ▁the ▁German ▁Imperial ▁Navy ▁as ▁SM ▁U B - 4 ▁on ▁ 2 3 ▁March ▁under ▁the ▁command ▁of ▁Ober le ut nant ▁zur ▁See ▁Karl ▁G ross , ▁a ▁ 2 9 - year - old ▁first -