Hi, I'm new to the board game and was wondering what the -1 modifier on a March order token denotes. Thanks for any help you can provide.

This is AGoT CARD GAME section.

You should ask this question at AGoT BOARD GAME section, here: https://community.fantasyflightgames.com/forum/220-a-game-of-thrones-the-board-game-second-edition/

Nevertheless this is your answer:

If you make an attack using this order your army receives -1 strength modifier.

Hi, is your question about the board game ? If so, you are in the wrong forum: this one if for the card game .

To answer your question, it denotes that any attack you make with that Move Order is at -1 to its total Strength.