Pen mightier than sword ?

Was the poet, Bulwer- Lytton right ?

My brother doesnt think so. He says Genghis Khan, Attila et al conquered with the sword ! 

True, This! —

Beneath the rule of men entirely great,
The pen is mightier than the sword. Behold
The arch-enchanters wand! — itself a nothing! —
But taking sorcery from the master-hand
To paralyse the Cæsars, and to strike
The loud earth breathless! — Take away the sword —

States can be saved without it!

Edward Bulwer-Lytton

If so, there is no need for the sword ! Can the pen save the nation, as Bulwer-Lytton said ? Can it improve the lot of humanity ? Can it bring a World Government based on equality ? 

Let us watch and see. 

If so, we have won !