When civil war broke out in 1962 between Yemeni royalists and republicans, Egyptian forces entered Yemen to support the new republican government, while Saudi Arabia backed the royalists. Tensions subsided only after 1967, when Egypt withdrew its troops from Yemen. Saudi forces did not participate in the Six-Day (Arab-Israeli) War of June 1967, but the government later provided annual subsidies to Egypt, Jordan, and Syria to support their economies.[7][8]