If you are here to ask for help beating a level of the campaign, please include the level number in the title of your message.
It is courteous to search for that level number in the messages before starting a new discussion.
The best way to search the subject lines on the index page is to press CTRL F in Windows, or CMD F on Mac, and type your search term.
While playing a level in "To Arms", you can find the level number by pressing the Gear icon button in the lower right of the game. You might need to first close a modal dialog by pressing the "X" button, and then the Gear icon button will appear. You will see the HP number, and under that is the LVL number, which you want.