 Complete the following phrase:  The elevation of Charles of Spain to Holy Roman Emperor, a position that Francis had desired, led to a collapse of relations between France and the Habsburgs. In 1519, a Spanish invasion of Navarre, nominally a French fief, provided Francis with a pretext for starting a general war; French forces flooded into Italy and began a campaign to drive Charles from Naples. The French were outmatched, however, by the fully developed Spanish tercio tactics, and suffered a series of crippling defeats at 