This occurred when Russia attempted to break their fleet out of port. While both Japan and Russia suffered losses, Japan was able to repair the damage to their ships while Russia's fleet reduced to a state of disrepair. Russia would refrain from any further attempts to break out of port following this naval defeat.
Editors. "Japanese cripple Russian fleet off Port Arthur". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11751, accessed 18 May 2013.]