He immediately accepted Mulligan 's offer to play for $7,500 , plus a $500 bonus .
In 1925 Mulligan set his sights on signing the quarterback of the Four Horsemen of Notre Dame .
Mulligan immediately accepted Mulligan 's offer to play for $7,500 , plus a $500 bonus .
In 1925 Mulligan set his sights on signing the quarterback of the Four Horsemen of Notre Dame .