Nope...Pharaoh wasn't about to be a big man, and allow Moses and Aaron to leave with His people without putting up a fight. He called God's bluff.
When you walk with God (and I don't mean say "hello" every so often, or attend church once in awhile), miraculous things happen. Blood, locust, frogs, gnats, flies, lice, disease, boils, hail, darkness and finally the death of the first born. Our Bible tells us that this took some time for all of these plagues to occur. Yet Pharaoh still wouldn't give in. We know that eventually he did, and not too long after, sent his army to bring them back. And, again, we know how that story ends. There's been speculation over the years about the parting of the Red Sea. Some say they crossed at the narrowest point and that it was "low tide", others deny it even happened. I am prone to go with the miraculous - since we are talking about God who often, to make a point, does what seems impossible. My image is the same as Mr. DeMille's - "But the children of Israel walked upon dry land in the midst of the sea; and the waters were a wall unto them on their right hand, and on their left. (Exodus 14:29)".
God can do and has done miraculous things. He uses people you'd least expect and takes care of situations that seem impossible to resolve. It is God, not karma, who continuously reminds His fallen souls to come back to His fold. He calls those who do not know Him. He calls those who don't believe His Word to be just that - His Word! He wants all people to know Him. He wants all people to know the power of His judgement. He wants all people to also know the magnitude of His forgiveness.
Some people are just evil (we know a few of them behind bars), some people are devious and lie like snakes in the grass, waiting. The Lord waits, too, and He is much more patient.
He gives each of us a chance to repent and be forgiven (and not just say, I'm sorry, I won't do it again). To repent means to change your ways. To fight the enemy when he tempts you. Justice on earth (winning an occasional court battle) is nothing compared to the justice that will befall the unbeliever or the blasphemer. THAT justice will be eternal. Be strong, be brave and know that God has everything well planned for you -- just as He did for the Israelites and Pharaoh...