[1] At the outbreak of war in August 1914 he enlisted for active service at the front and was given command of the 13th Battalion (Royal Highlanders of Canada), CEF.

In March 1916, Loomis was promoted to the temporary rank of brigadier general[2] and took command of the newly formed 7th Canadian Infantry Brigade.

[1] He was also highly decorated during the war, earning the Distinguished Service Order (DSO) in June 1915 and a bar to his DSO three years later, the citation for which reads: For great gallantry and brilliant leadership during the operations south-east of Amiens, 8th/9th August, 1918, and east of Arras, 2nd September, 1918.

He made reconnaissances under heavy fire, personally superintending the disposition of troops and encouraging all by his coolness and ability.

[5]On November 11, 2018, the hundredth anniversary of the Armistice with Germany, The Black Watch (Royal Highland Regiment) of Canada, with bagpipes and drums playing, marched through the streets of Mons to the building that was Major-General Frederick Loomis’s headquarters during the First World War.