The disadvantage of having periodically or occasionally paid recruits was that if their money had not arrived on time, they simply left the battlefield, or – in a worse scenario – they revolted, as has happened in several instances. Since they were the same skilled men-at-arms led by the same leaders previously fighting under the Hungarian flag, they were as difficult to eliminate as the Black Army was to its enemies. However, they could be outnumbered, since it was always a flank or division which quit the campaign. An easier solution was to have the captain accept some lands and castles to be mortgaged in return of service (in one occasion the forts of Ricsó (Hričovský hrad) and Nagybiccse (Bytča) to František Hag). An example of mass desertion occurred in 1481 when a group of 300 horsemen joined the opposing Holy Roman forces. One of these recorded insurrections was conducted by Jan Švehla, who accompanied Corvinus to Slavonia in 1465 to beat the Ottomans; but when they were approaching Zagreb, Švehla asked for royal permission to officially quit the offensive with his mercenaries due to financial difficulty. His request was denied, and as a consequence, he and two of his vice-captains left the royal banner along with their regiments.