`Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms
a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
someone who exhibits great independence in thought and action动词rebel
take part in a rebellion; renounce a former allegiance
break with established customs
The rebels went on the offence against the ruling military party.
Ethnic-Somali rebels in the south-east of Ethiopia say they have launched an offensive against government forces and captured several towns.