Boss Zagstruk and Da Vulcha Boyz

When an Ork mob charges into close combat roll a 2D6. If the score is equal to or under the number of Orks in the mob they charge in with a rousing "Waaaaaaaaagh!". All the Orks in the mob double thier Initiative characteristic for the remainder of the assault phase. In future phases their Initiative returns to normal.
Orks who make sweeping advanced into the enemy also tests for The Power of the WAAAGH!. The test is made at the beginning of the assault phase so any casualties from enemy first will reduce the chances of them maintaining their momentum.