Morale suffered badly and friction broke out amidst the different Allied nationalities, with troops having had no home leave in a year, or nearly two in the case of men who had been at the Dardanelles. Unlike the concurrent mutinies in France, those in this theatre were led by French NCOs. There were no executions, and leaves were granted as a concession, although some ringleaders were sentenced to prison and forced labour. In May the Allied governments authorised Jonnart, French High Commissioner, to remove King Constantine. On 11 June a stronger Allied naval force, accompanied by 13,000 troops, forced King Constantine's abdication in favour of his son, whilst Sarrail sent a division into Salonika. Venizelos became Prime Minister again and declared war on the Central Powers at the end of June.