Currently citizen soldiers get:
+20% health from advancing to the town phase +10% health from advancing to the city phase +10% health from promoting to the advanced rank +10% health from promoting to the elite rank
This patch removes the free health increases from the phase advances (other units or structures don't get this either), raises the rank bonuses to +25% each, and updates the tooltips.
The final difference is minor, previously +59.72%, now +56.25%. (For comparison, champions have +100%.)