It proved the worth of the Condor Legion to the Nationalist cause .
The offensive on Bilbao , when it eventually came on 11 July , was supported by ground units of the Condor Legion , and extensive air operations .
Condor Legion proved the worth of the Condor Legion to the Nationalist cause .
The offensive on Bilbao , when it eventually came on 11 July , was supported by ground units of the Condor Legion , and extensive air operations .