After his father died, Judas Maccabeus took command of the Jewish army opposing the Greek armies. His successes mirrored that of his ancestor David.
When faced with a strong army, his small company asked him, "How can we, few as we are, fight against so great and strong a multitude. Besides, we are hungry." Judas assured them, "It is not the size of the army that victory in battle depends, but strength comes from heaven."
They won that battle decisively.
Do you have some examples in your own life when you tried something that seemed impossible?