sentences:  However, an advance on Edinburgh was blocked by Stirling Castle which the Jacobites failed to capture in 1746 with considerably better siege equipment, while lack of cavalry made them vulnerable in the open.Even experienced leaders like Dundee found it hard to keep a Highland army in the field, while the increase in numbers after Killiecrankie to 4,000 – 5,000 did not necessarily improve fighting capacity.Supplying a force of this size was far more difficult and the new recruits included many like the MacGregors who saw it primarily as an opportunity for raiding.