Explain the disagreement that Brutus and Cassius have about the battle strategy?

Brutus wants to march to Phillipi.  In other words, he
want to take to battle to them.  Cassius wants to stay put and let the battle come to
them.

Cassius believes that if they stay where they are, 
Anthony and Octavius will need to come to them, thus wearing their troops out before the
battle itself.  By staying where they are their troops will be fresher for the
battle.

Brutus feels that it is better to take their troops
and meet Anthony and Octavius at Phillipi since the people in between where they
currently are and Phillipi cannot be trusted to be loyal to them.  It would be better
for them to show these people a show of force to keep them in
line.

Brutus wins the arguement and they march to Phillipi
where they are defeated.