What does AD VIM MAJOREM VEL AD CASUS FORTUITUS NON TENETUR QUIS, NISI SUA CULPA INTCR- VENERIT mean?

AD VIM MAJOREM VEL AD CASUS FORTUITUS NON TENETUR QUIS, NISI SUA CULPA INTCR- VENERIT meaning in Law Dictionary

No one is held to resolve for the ramifications of a superior force, or of accidents, unless his own fault features added. Fleta, lib. 2, c. 72,