Short history from Wikipedia (
https://en.wikipedia.org/wiki/Latvian_Riflemen)
Towards the end of the 19th century, Riga, the capital of Latvia, became one of the most industrialised cities in the Russian Empire. The Latvian Social Democratic Workers' Party (LSDRP) was well organised and its leading elements were increasingly sympathetic to the Bolsheviks by the time of the 1905 Revolution.
I World War
By April 1915, when the German Army was advancing into Latvian territory, some prominent Latvians, led by Jānis Goldmanis used their position in the Duma to call on the Tsar to establish all-Latvian battalions. As Germany was advancing into Latvia, they argued, such units would be particularly effective. Latvians knew the area and had high morale because despite the policy of Russification, Latvian nationalist sentiments were more anti-German.[1] At Jelgava two battalions of the Latvian Home Guard had already held back the German advance guard.
From 1915 to 1917, the Latvian Riflemen fought in the Russian army against the Germans in positions along the Daugava river. In 1916 Latvian battalions were transformed to regiments as conscription started among the local population. Also many new riflemen units were formed. In total eight combat and one reserve regiment were formed. In December 1916 and January 1917, the Latvian riflemen suffered heavy casualties in the month-long Christmas Battles, which began with a surprise attack on German positions during Christmas. Suffering heavy casualties, Latvian riflemen managed to break the German line of defence but the effort was wasted as the attack was not followed through. The Russian Army lost over 26,000 soldiers in the failed attack. The casualties included 9,000 Latvian riflemen, about a third of the total number at that time. The heavy casualties resulted in a strong resentment against the Russian generals and the Tsar among the riflemen. This resentment led to an increased support for the Bolsheviks, who were advocating an end to the war.
Red Latvian Riflemen
In May 1917 the Latvian Regiments transferred their loyalty to the Bolsheviks. They became known as Red Latvian Riflemen (Latvian: Latviešu sarkanie strēlnieki, Russian: красные латышские стрелки) and actively participated in the Russian Civil War. The Riflemen took an active part in the suppression of anti-Bolshevik uprisings in Moscow and Yaroslavl in 1918. They fought against Estonia, Denikin, Yudenich, and Wrangel. After victory in Oryol-Kromy operation (ru:Орловско-Кромское сражение) against Denikin in October 1919 division of Latvian Riflemen received the highest military recognition of that time: the Honorable Red Flag of VTsIK. Jukums Vācietis, formerly a colonel in the Latvian Rifles became the first commander-in-chief of the Red Army.
The Latvian Red Riflemen were instrumental in the attempt to establish Soviet rule in Latvia in 1919. They suffered great losses of personnel due to the decreasing popularity of Bolshevik ideas among the Latvian Riflemen and Latvians generally, and the majority were re-deployed to other fronts of the Russian Civil War. The remaining forces of the Red Army in Latvia were defeated by Baltic German volunteers under General von der Goltz and newly formed Latvian units initially under Colonel Kalpaks and later under Colonel Jānis Balodis, who were loyal to the Latvian Republic in western Latvia; by the Estonian Army including the North Latvian Brigade, and finally by a joint campaign of the Polish and new Latvian army in Latgale, south-eastern Latvia.
Following the 1920 peace treaty between Latvia and Bolshevist Russia, 11,395 former Red Riflemen returned to Latvia.[citation needed]
Other former Riflemen remained in Soviet Russia and rose to leadership positions in the Red Army, Bolshevik party, and Cheka. When the USSR occupied Latvia in 1940, many of the surviving Red Riflemen returned to Latvia.