Here is the altered version of the text, employing synonyms and altered sentence structure while preserving HTML tags and formatting:
Target and shoot! A conflict has started, hostile vessels and planes are closing in swiftly. You and your cannons are the ultimate safeguard for our country. This gun emplacement, with complete rotational mobility, is ideally suited to fight off the opposing offense upon DEF Island. Prepared to engage?
Use a pointing device or your digits to control.
