exhaust (someone's) resources

Translations
исчерпать (чьи-то) ресурсы
The long campaign exhausted their resources.
Долгая кампания исчерпала их ресурсы.
Definitions
To deplete or use up all of someone's available resources, such as time, energy, money, or materials, often leaving them with nothing left to draw upon.
Words
resource

noun
ресурс
exhaust

verb
исчерпать