The war in which Joan of Arc played an important role was The 100 Years War. She claimed to have received visions telling her give support to Charles VII in the effort to prevent English domination in France. The 100 Years War was a direct conflict between England and France over who had the right to rule as King in France. The issue arose when the previous French king died without a son and the King of England believed had the right to rule over France in the absence of an heir.