An Israeli reservist brandishes his weapons before crossing into the northern Gaza Strip January 12, 2009. An Israeli military spokesman said army reservists had been thrown into the campaign that Israel launched with the declared aim of ending cross-border rocket attacks from the Hamas-ruled territory to its south. Israeli troops fought gun battles with Hamas fighters on Monday, keeping military pressure on the Islamist group while avoiding all-out urban warfare that would complicate ongoing diplomatic efforts to end the Gaza war. [Agencies]