Characters in Act 4:

Important Quotes:

We at the height are ready to decline.
There is a tide in the affairs of men
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
On such a full sea are we now afloat,
And we must take the current when it serves,
Or lose our ventures. (IV.ii.269–276)

This quote is spoken by Brutus in Act IV, scene ii and it shows that he is ready for the battle to begin against Antony and Octavius.
The video above shows what happens in Julius Caesar Act IV.