[The text is quite long, but you are able to glean a few details:] Battle standards have been a necessary part of warfare in Pays-de-la-Gloire for at least three centuries: Once armies grew beyond a size where every lieutenant could stay within earshot of their captain, it became necessary for units to be able to identify one another from a distance, usually so that messengers carrying orders could be sure they were delivering them to the correct recipient. Banners commonly bear the heraldry of the House that owns them, or the personal arms of the unit commander, and there is commonly a strict order of precedence determine the deployment of a unit on the battlefield.
Banner Guards II
[The text is quite long, but you are able to glean a few details:] To be chosen to carry the army's banner is a great honour; accordingly it is granted only to those who have displayed conspicuous courage and hold the esteem of the rank-and-file. The common image of a banner-bearer is an older man of common birth who has survived many battles and has a voice that can be heard across an entire county.
Banner Guards are sworn to protect their burden with their lives, not to allow the banner to touch the ground, to be captured, and in case of retreat to To fail in any of these duties would not only be a grave dishonour, but also a great tragedy.