ario , ▁to ▁fort ify ▁it ▁against ▁a ▁possible ▁royal ist ▁attack ▁from ▁the ▁Eastern ▁Band ▁of ▁the ▁Uruguay ▁River . ▁While ▁there , ▁he ▁created ▁the ▁flag ▁of ▁Argentina . ▁The ▁First ▁Tri um vir ate ▁did ▁not ▁appro ve ▁the ▁flag , ▁but ▁because ▁of ▁slow ▁communic ations , ▁Bel gr ano ▁would ▁only ▁learn ▁of ▁that ▁many ▁weeks ▁later , ▁while ▁rein for cing ▁the ▁Army ▁of ▁the ▁North ▁at ▁Ju ju y . ▁There , ▁knowing ▁he ▁was ▁at ▁a ▁strateg ic ▁dis adv antage ▁against ▁the ▁royal ist ▁arm ies ▁coming ▁from ▁Upper ▁Peru , ▁Bel gr ano ▁ordered ▁the ▁Ju ju y ▁Ex od us , ▁which ▁ev acu ated ▁the ▁entire ▁population ▁of ▁Ju ju y ▁Province ▁to ▁San ▁Miguel ▁de ▁T uc um án . ▁His ▁counter - off ensive ▁at ▁the ▁Battle ▁of ▁T uc um án ▁resulted ▁in ▁a ▁key ▁strateg ic ▁victory , ▁and ▁it ▁was ▁soon ▁followed ▁by ▁a ▁complete ▁victory ▁over ▁the ▁royal ist ▁army ▁of ▁P ío ▁Tr ist án ▁at ▁the ▁Battle ▁of ▁Sal ta . ▁However , ▁his ▁deeper ▁inc urs ions ▁into ▁Upper ▁Perú ▁led ▁to ▁defe ats ▁at ▁Vil cap ug io ▁and ▁Ay oh uma , ▁leading ▁the ▁Second ▁Tri um vir ate ▁to ▁order ▁his ▁replacement ▁as ▁Commander ▁of ▁the ▁Army ▁of ▁the ▁North ▁by ▁the ▁newly ▁arrived ▁José ▁de ▁San ▁Martín . ▁By ▁then , ▁the ▁As am ble a ▁del ▁A ño ▁XIII ▁had ▁approved ▁the ▁use ▁of ▁Bel gr ano