1481. Sixtus combines with the Venetians against Ferrara 258
" Federigo declines their offers, and vainly inculcates peace 259
1482. April 17. He is engaged to command the League in defence of Ferrara 259
" " 23. His departure for the campaign 260
" Description of the seat of war 261
" May 3. War declared by Venice 262
" " 11. The