From the creators of Battlefield, and it's easy to tell.
The creators of the most played and known online battle-game "Battlefield 1942" and "Battlefield 2" created Codename Eagle in 1999 before these games.
It's easy to see when you play multiplayer. Lots of tanks and planes to play it was amazingly fun. However this game got alot of bad reviews so its rare to play with anyone online when it was released.
Still it was enjoyable even with 2-3 other humans online.
Singleplayer wasn't anything to speak off. But even today Battlefield 1942 and battlefield 2 dont have singleplayer to speak off either, just simple bot matches. It's all multiplayer.