Sarrail launched a general offensive between 22 April and 23 May 1917, to coincide with Nivelle's offensive on the Aisne. The British attacked around Lake Doiran at a cost of 5,000 dead and seriously wounded, one quarter of all British casualties throughout the entire Salonika Campaign. Another British attack in the Struma Valley was more successful, although in the centre of the line the French offensive under Grossetti, launched from Monastir on 9 May, failed amidst disease and logistical failures (severe penalties were inflicted on those caught scrounging food). Sarrail's "Spring Offensive in the Orient" had incurred 14,000 casualties for little gain.