General Sir Peter Wall, Chief of the General Staff, said he was "confident" the Army would still perform effectively despite the loss of 4,480 jobs today.
Sir Peter did admit that the redundancies would put "morale under strain."
The head of the Army has warned that any gap between military resources and planned capabilities caused by spending cuts "could become quite dangerous, quite quickly".
Chief of the General Staff General Sir Peter Wall said imposing further efficiencies while the impact of previous deep spending cuts on the armed forces were still being absorbed would be "very disruptive".
His comments came with the Ministry of Defence under pressure to deliver its share of the £11.5 billion spending cuts across Government demanded by Chancellor George Osborne in his spending review later this month.
Sir Peter was interviewed as part of the Britain's Last War documentary broadcast on Sky News this evening.