The enemy cannot comprehend

( One day later ...) 

The infirmary was currently at full capacity , sick soldiers and dead soldiers were littered all over the infirmary. It seemed like an epidemic had broke in the fort. 

The very water used to treat these sick patients , being fed to them every hour , was the poison to their health , whereas those who were healthy were slowly consuming the contaminated food. The odorless and tasteless poison had did its job , there was nobody that was wiser of the ploy yet. 

However with more and more seemingly healthy soldiers falling sick after eating food or drinking water , many started to get suspicious. Nearly 40% of the fort staff was currently posioned and battling for their life. 

It was then that a local specialist healer who was called for , in urgency came to the location and after checking all the patients decided that , they were poisoned.