Ivan Pyryev - Traktoristy (Трактористы) AKA Tractor-Drivers (1939)

From Mosfilm:
A musical comedy.
The mid 30s. Klim Yarko, a demobilized tank driver from the Far East returns to the Ukraine collective farm where Maryana Bazhan, his long-standing love, lives. But Maryana is a famous tractor-driver of the vicinity and her admirers are legion. In attempt to get rid of them she invents a story of her love to Nazar, a butch and bummer. Klim, a simple soul, finds himself in a complicated situation but finally due to his sincerity and industry he wins sympathies of the whole farm and the famous Maryana’s love.

Sergei M. Eisenstein - Aleksander Nevsky (Александр Невский) (1938)

From Criterion Collection:

Eisenstein drew on history, Russian folk narratives, and the techniques of Walt Disney to create this broadly painted epic of Russian resilience. This story of Teutonic knights vanquished by Prince Alexander Nevsky’s tactical brilliance resonated deeply with a Soviet Union concerned with the rise of Nazi Germany. Widely imitated—most notably by Laurence Olivier’s Battle of Agincourt re-creation for Henry V —the Battle on the Ice scene remains one of the most famous audio-visual experiments in film history, perfectly blending action with the rousing score of Sergei Prokofiev.