Now come the factors favoring the besieged.

The assailing army, despite its superior numbers, is far in the enemy's country.

It may be attacked at any time by another army outside, small, but led by a very able general.
Now, you have both sides presented to you, but I have already arrived at the determining factor.

What would you say it is, Dick ?" "I don't know." "You haven't used your reasoning powers.

Remember that the man who not merely thinks, but who thinks hard and continuously always wins.