Detective Comics #27 (May 1939) featured the first appearance of Batman (as "The Bat-Man") with "The Case of the Chemical Syndicate," as the Batman first story. That superhero would eventually become the star of the title, the cover logo of which is often written as "Detective Comics featuring Batman".

Finger said, "Batman was originally written in the style of the pulps", and this influence was evident with Batman showing little remorse over killing or maiming criminals and was not above using firearms.

Batman proved a hit character, and he received his own solo title in 1940, while continuing to star in Detective Comics. By that time, National was the top-selling and most influential publisher in the industry; Batman and the company's other major hero, Superman, were the cornerstones of the company's success.
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Detective Comics

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