Major General Wilkama was appointed Commander-in-chief of the Finnish Army on 31 May 1918, when General of the Cavalry Mannerheim was granted leave from his position.
Generalmajor Wilkama blev udpeget til øverstkommanderende for den finske hær den 31. maj 1918 da kavalerigeneral Mannerheim fik bevilget orlov fra sin stilling.