 Wemyss akashanda muHondo Yenyika Yekutanga, pakutanga semutungamiri we12th Cruiser Squadron muChannel Fleet uyezve, mushure mekutumirwa kuLemnos nechinyorwa chekugadzirira chiteshi cheMoudros chekuita mabasa kurwisa Dardanelles muna Kukadzi 1915, saGavhuna weMoudros. Akatungamira boka revarwi pakumhara kweBritain paCape Helles musi wa25 Kubvumbi 1915 uye akatsigirawo kumhara kweBritain paSuvla Bay paGallipoli Front.musi wa9 August 1915. Apo Campaign yeGallipoli yakasiyiwa iye akanga ane mutoro wokubudirira kudzokazve kwemauto kubva kuSuvla Bay uye kubva kuAri Burnu musi wa20 December 1915. Akagadzwa kuva Knight Commander weOrder yeBhati mu1916 New Year Honours. 