Conversation so far:
What happened to Charlie Macartney post-World War I?
After the war, Macartney transformed himself into one of the greatest batsmen of his era.
What is Test cricket?
Test cricket is the form of the sport of cricket with the longest match duration, and is considered the game's highest standard.

Question: How did the war effect his career?
Self-contained rewrite: How did World War I affect Charlie Macartney's cricketing career?