When Saul heard their words, the Spirit of God came upon him in power, and he burned with anger. 1 Samuel 11:6
There are occasions in which righteous anger is justified by God. It is a type of anger that does not lead to sin, but fulfills God's purposes.
Saul had just been crowned as the new king of Israel. His first battle was upon him, and he had to bring a new nation together to fight the Ammonites. The Spirit of God fell on Saul and resulted in righteous anger against God's enemies. God led him to send an unusual "direct-mail" package to all the regions where the people lived. He cut up pieces of oxen and sent the pieces throughout Israel with a warning-"Join the army or your oxen will be as these!"
Sometimes God uses strong measures to accomplish His purposes. In this case, fear and intimidation were used to motivate the army of God to be as one. God must have felt this is what was needed to drive this army to become a unified force.
God knows the only way to achieve success is if the army is one. A house divided cannot stand. What will it take to unify your company, your church, and your family to be one? Unless you are one, you cannot win the battles you will face. Ask God to make you and those you walk with to be one in mission and one in spirit.