lì / shǐ / zī / liào / zhōng / tí / dào / yǐ / chǒu / nián / fā / shēng / le / zhè / chǎng / zhòng / yào / zhàn / yì

历史资料中提到，乙丑年发生了这场重要战役。

Historical records mention that this important battle took place in an Yichou year.