Upon his return to France, religious disputes led to Henri becoming the leader of a Huguenot revolt. Henri led three wars, each of which was halted by a fragile peace. After the third war, Henri fled to Venice. He was recalled to war when France more directly entered the Thirty Years' War, but after another successful run as a commander, was forced into retirement. He joined the forces of Bernard of Saxe-Weimar, and was mortally wounded in battle in 1638.
Bernard noted that Henri would live several decades longer than in OTL. The changes brought on by the up-timers ensured that the battle between them that led to Henri's death would not happen.
Henri and his daughter are caught up in the instability resulting in Gaston's coup of France