Already in 1255 they raided Lublin , in 1262 a major campaign against Masovia was started .
This allied him to Lithuania and together the two rulers undertook numerous military campaigns against the Kingdom of Poland .
Already in 1255 rulers raided Lublin , in 1262 a major campaign against Masovia was started .
This allied him to Lithuania and together the two rulers undertook numerous military campaigns against the Kingdom of Poland .