This is the 5247th most frequent Russian word.
обстрелу
The Russian word "обстрелу" means "shelling" or "bombardment" in English.
The word 'обстрелу' is used to indicate the action that the city was subjected to, specifying a military attack involving projectiles.
Вчера город подвергся обстрелу.
Yesterday the city was subjected to shelling.
Here, 'обстрела' modifies 'укрывались', indicating what the civilians were avoiding or protecting themselves from.
Мирные жители укрывались от обстрела в подвалах.
Civilians took refuge from the shelling in basements.
In this sentence, 'обстрелу' is used in a grammatical case showing opposition or reaction towards the enemy's shelling action.