Milne undertook numerous offensives in support of his French and Serbian Allies with limited resources. His attack at Lake Doiran in spring 1917 cost 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. His troops were constantly suffering from malaria. Milne was appointed a Grand Officer of the Order of Saints Maurice and Lazarus by the King of Italy on 31 August 1917 and advanced to Knight Commander of the Order of the Bath on 1 January 1918. Although Milne was repulsed again at Lake Doiran in September 1918, French and Serbian units were successful in defeating the Bulgarian Army at the Battle of Dobro Pole which took place that same month. Bulgaria then signed an armistice.