In Europe Blenheim is regarded as much a victory for Eugene as it is for Marlborough, a sentiment echoed by Sir Winston Churchill (Marlborough's descendant and biographer), who pays tribute to "the glory of Prince Eugene, whose fire and spirit had exhorted the wonderful exertions of his troops." France now faced the real danger of invasion, but Leopold I in Vienna was still under severe strain: Rákóczi's revolt was a major threat; and Guido Starhemberg and Victor Amadeus (who had once again switched loyalties and rejoined the Grand Alliance in 1703) had been unable to halt the French under Vendôme in northern Italy. Only Amadeus' capital, Turin, held on.