[1] Druvė was born in the Manor of Pavirvytis [lt] (now Lithuania), which belonged to the Lithuanian noble Šemeta family.

[2] Pierre Drouvet and Morta married; and together with the Grande Armée, having experienced various adventures on the way, went to the French region of Burgundy.

[3] Druvė was promoted to lieutenant colonel of the 11th Uhlan Regiment in 1912 for his distinction in imperial service.

[3] During World War I, in the autumn of 1915, Druvė led a cavalry unit where he was distinguished for his fighting against the Imperial German Army near the Daugava River.

[1] He helped Plechavičius organize anti-Communist Lithuanian partisans in the towns of Eigirdžiai, Raudėnai [lt], Tryškiai and Ubiškė.