You are the King of a successful and prosperous kingdom. News arrives that 3 armies (one from the north, one from the west, one from the south) are planning to attack your kingdom.
Option 1 - you get ready for a siege and plan your attack strategy. This option will be a successful one.
Option 2 - You decide to prepare your army to ride out and meet your enemies on a chosen battlefield.
Option 2 - You find out that the Northern army will arrive first and the Western and Southern army will arrive at the castle about 5 days later as they have further to travel. Option 2a - You decide to take half the army north and leave half the army to defend the castle.
Option 2a - You ride out to meet the Northern army. You win the battle but the other 2 enemy armies have reached your castle. Your castle is now under siege. You have a plan to surprise the enemy from behind. The enemy is caught off guard by your surprise return and attack. As a result you are successful in defeating the enemy from behind their lines and successful in attacking them from the castle walls.
Option 2 - You find out that the Northern army will arrive first and the Western and Southern army will arrive at the castle about 5 days later as they have further to travel. Option 2b - You decide to ride out and meet all 3 enemies head on a battlefield. You take one third of your army north, order another third to head west, and the remaining third to head south.