Conversation so far:
What can you tell me about Concentration at Corinth?
Johnston had various remaining military units scattered throughout his territory and retreating to the south to avoid being cut off.
Where did he have these units?
Johnston's army of 17,000 men gave the Confederates a combined force of about 40,000 to 44,669 men at Corinth.
Are there any other interesting aspects about this article?
Johnston now planned to defeat the Union forces piecemeal before the various Union units in Kentucky and Tennessee under Grant with 40,000 men at nearby Pittsburg Landing.
Was he successful at this?
intent on surprising Grant's force as soon as the next day, but they moved slowly due to their inexperience, bad roads and lack of adequate staff planning.
Does it state how many men he lost?
CANNOTANSWER.

Question: Who did he serve with?
Self-contained rewrite: Who did Albert Sidney Johnston serve with?