Correct

三大战役

/ sān dàzhàn yì / 
Strokes

Example

As a Noun

three major campaigns ［the three biggest campaigns during the Liberation War launched by the People's Liberation Army against the KMT troops, i.e. the Liaoshen Campaign, the Huaihai Campaign and the Pingjin Campaign］

1
Fǎnyìng
反映
sān
三
dàzhànyì
大战役
de
的
xiǎoshuō
小说

novel on the three major campaigns