In the siege of Bilbao, Zumalacárregui was wounded in the leg by a stray bullet. The wound was not serious, he was treated by a number of doctors, famously by Petrikillo (nowadays meaning in Basque 'quack' or 'dodgy healer'). The relationship of the pretender to the throne and the commander in chief was at least distant; not only had they differed in operative strategy, but Zumalacárregui's popularity could undermine Carlos' own authority, as in the early stages of the war, the Basque general was offered the crown of Navarre and the lordship of Biscay as king of the Basques. The injury did not heal properly, and finally General Zumalacárregui died on June 25, 1835. Many historians believe the circumstances of his death were suspicious, and have noted that the general had many enemies in the Carlist court; however, to date no further light has been shed on this point.