“in front of the enemy lines” – 16,500,000 search results on Google
“behind the enemy lines” – 13,600,000 search results
“under the enemy lines” – 68,700 search results
“above the enemy lines” – 48 search results
“parallel to the enemy lines” – 20 search results
“opposite the enemy lines” – 12 search results
“beside the enemy lines” – 6 search results
“perpendicular to the enemy lines” – 5 search results
“kitty-corner from the enemy lines” – 0 search results
Grigory Lukin.com 
caddy-corner from the enemy lines 1,450,000 results…
Actually, that entire phrase brings up zero results – you need to wrap it in quotation marks when you search for it. Otherwise, you get results that just have one or two words from the query. Nice try, though! 😉