Campaign Map on 27 October 1813
Wellington expects the French to attack Corunna
He orders 3rd corps to support 1st corps there
He also orders supplies from Ourense to Santiago
7th French corps retreats due to losing the battle of Corunna
In doing so they use up the last of their supplies
Soult orders 16th Italian corps to join them at Ribadeo
This is to secure Ribadeo
He will not be able to attack for at least two days
He also orders 8th and Reserve corps to prepare to attack Ourense
7th French corps fought the battle of Corunna with just one days supply
Because they lost they had to retreat, reducing their supplies to zero
If they do not halt and resupply next day they will start to lose attrition casualties
When a corps runs out of supplies it loses 400 infantry men each day to attrition
The CinC can decide which brigade will lose those men
They will continue to lose 400 infantry for each day they remain out of supply
To resupply they must be within three squares of a friendly supply depot
They must also remain stationary and can not initiate any combat
If attacked they must retreat, causing them to lose 400 attrition casualties
For this reason most corps will resupply before they reach one days supplies
However if they are attacked, and can not retreat, they can not resupply
For example if ordered to hold and resupply, they must fight if attacked
This is what happened to 7th corps at Corunna
Having fought a very successful campaign, the French have run into a series of supply problems.
This was partly caused by guerrilla activity.
It is starting to have a serious impact on the French campaign.
The consequences is that they have lost the initiative, which has been taken up by Wellington.