Byzantine attempts to stem Preventing_or_letting the slow but successful Arab conquest Conquering of Sicily ended Process_end in a dismal failure .

`` Barrel Roll '' and the `` Secret Army '' attempted to stem Preventing_or_letting an increasing tide of People 's Army of Vietnam ( PAVN ) and Pathet Lao offensives .

In essence , the Battle Hostile_encounter of the Atlantic was a tonnage war Hostile_encounter : the Allied struggle Resolve_problem to supply Supply Britain and the Axis attempt to stem Preventing_or_letting the flow of merchant shipping Sending that enabled Preventing_or_letting Britain to keep Temporary_stay fighting Hostile_encounter .