I've been considering how these units could be back incorporated into the Peninsula scenarios in a historical fashion.
Key Highland Regiments in the Peninsula
42nd Royal Highland Regiment (The Black Watch): Fought in numerous major engagements, including Corunna, Fuentes de Oñoro, and the Pyrenees, famously holding captured redoubts at critical moments.
71st (Highland) Regiment of Foot (Light Infantry): Converted to light infantry tactics in 1809 and served with high mobility through Vimiero, Vitoria, and the storming of Badajoz.
74th (Highland) Regiment of Foot: Part of Picton’s 3rd Division, seeing heavy action at Busaco, Fuentes de Oñoro, Salamanca, and Toulouse.
79th Cameron Highlanders: Joined the campaign later and distinguished itself in the Low Countries and Pyrenean campaigns.
91st Argyllshire Highlanders: Served prominently within the 6th Division, providing critical support and counter-attack stabilization at key engagements like the Pyrenees.
92nd Gordon Highlanders: Renowned as aggressive shock infantry, participating in Corunna and the Almaraz expedition.
all very well, but generally speaking, units in CCN are Brigades, so what I was looking for was situations where several Highland Regiments were brigaded together. This seems to have happened in two instances;
2nd Division: Lieutenant-General R. Hill (Stewart acting) Brigade: Walker
1/50th Foot Regiment
1/71st Highland Light Foot Regiment
1/92nd Highland Foot Regiment
5/60th Foot Regiment (1 coy)
6th Division: Lieutenant-General Sir H. Clinton
Brigade: Pack
1/42nd Foot Regiment
1/79th Foot Regiment
1/91st Foot Regiment
5/60th Foot Regiment (1 coy)
So I think substituting a Highland Infantry unit to replace a Line unit when part of a group of units under those 2 leaders might be the key identifier for CCN scenarios.
A quick look up on my
CCN Leaders spreadsheet
may help:
Pack B008 B009 EPIC21 GB06 GBX02 EPIC07
Walker M516 GB09 EPIC11