Alina Starkov and Malyen Oretsev had their military training in Poliznaya alongside many other soldiers, including Ruby and Luchenko. Nikolai Lantsov and Dominik also went through basic training there.
After they take Os Alta and Alina is placed in charge of the Second Army, she brings military experts from Poliznaya to help familiarize the Grisha with modern weaponry. Should the Darkling attack Os Alta, Alina and her allies plan to hold up in the domed hall to wait for reinforcements from Poliznaya, but when he does come, he overwhelms their forces and they flee instead.
Under the Darkling's rule, there are mass desertions from the base at Poliznaya and the northern and southern fronts.
King Nikolai stores the antidote to jurda parem in Poliznaya. While there, he receives word that General Raevsky had routed Fjerda at Ulensk. Queen Makhi Kir-Taban's airship lands at Poliznaya, and General Pensky escorts her entourage to Os Alta. Poliznaya is badly damaged when the Fjerdans attack. The Ravkans lose over half their flyers, most of their airships, and their stores of titanium.