When Latvia found itself in World War I, Grosvalds joined up for active service and relayed this experience into his art (cf. The Refugees, 1915-1917 series, and Latvian Riflemen, 1916-1917 series).
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His ground-breaking work on Jukums Vācietis and the Latvian Riflemen's role in the Bolshevik Revolution paved the way for further research on this subject by other Latvian émigré historians, notably the early works of Andrew Ezergailis.