orła wrona nie pokona

Etymology
Rhyme, literally "a crow won't beat an eagle". A reference to Military Council of National Salvation, a military junta that ruled during the period of martial law in Poland, the initialism of which (WRON) was very similar to, and the Polish coat of arms, a white eagle.

Proverb

 * 1)  anti-communist resistance will not be defeated by repressions and martial law