▁to ▁confront ▁the ▁Ne ap ol itan / Span ish ▁invasion ▁by ▁calling ▁in ▁isolated ▁g arr isons ▁throughout ▁Cal ab ria ▁and ▁request ing ▁that ▁Pr é cy ▁rein force ▁him ▁with ▁the ▁Swiss ▁mer cen aries . ▁In ▁the ▁following ▁Battle ▁of ▁Sem in ara ▁the ▁Spanish ▁and ▁Ne ap ol itan ▁arm ies ▁were ▁rout ed ▁by ▁the ▁French ▁caval ry ▁and ▁Swiss ▁p ik emen ▁led ▁by ▁the ▁Sc ots man ▁A ub igny . ▁ ▁Stewart ▁also ▁took ▁part ▁in ▁the ▁ 1 4 9 9 ▁campaign ▁of ▁King ▁Louis ▁XII ▁of ▁France ▁and ▁upon ▁its ▁successful ▁conclusion ▁was ▁made ▁Governor ▁of ▁Milan ▁with ▁command ▁of ▁the ▁French ▁army ▁that ▁was ▁left ▁behind ▁by ▁the ▁king ▁to ▁g arrison ▁the ▁towns ▁of ▁northern ▁Italy . ▁In ▁ 1 5 0 1 ▁he ▁completed ▁the ▁con quest ▁of ▁Nap les ▁and ▁was ▁appointed ▁Governor . ▁But ▁after ▁a ▁few ▁success es ▁in ▁Cal ab ria ▁he ▁was ▁completely ▁defeated ▁at ▁the ▁second ▁Battle ▁of ▁Sem in ara ▁( 1 5 0 3 ) ▁and ▁became ▁a ▁prisoner ▁at ▁the ▁Cast el ▁Nu ovo ▁in ▁Nap les ▁until ▁he ▁was ▁released ▁by ▁a ▁tr uce ▁signed ▁on ▁ 1 1 ▁November ▁ 1 5 0 3 . ▁ ▁Later ▁life ▁In ▁ 1 5 0 8 ▁he ▁was ▁sent ▁as ▁amb assador ▁to ▁consult ▁King ▁James ▁IV ▁of ▁Scotland ▁about ▁the ▁marriage ▁of ▁Princess ▁Claude ▁of ▁France ▁with ▁the ▁future ▁King ▁Francis ▁I ▁of ▁France . ▁It ▁was ▁as ▁a