Techgage will take you through the improvements offered by the summer update of Day of Defeat.  Read the article while you are waiting for Steam to finish the download.
“Valve has unleashed a new DoD: Source update, and this one is a winner. Included is a brand new mode, Detonation, which will be familiar to some CS players. Two new maps and the film grain graphic effect are also included. We give our first impressions inside.”

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