Maintaining the large British army is expensive, and further expansion depends on dealing with the American forces nearby. The plan is to destroy one army while another force pins nearby troops, opening a hole in the opponent's wider force structure. Philadelphia is a priority because it functions as the American technology hub in this game. The Americans have also acquired Prussian territory, helping explain the size of the army that must be dealt with next.
Notable Point · 3:45:43-3:47:04
A technology hub as an operational objective
Philadelphia's research role makes it an urgent campaign objective, alongside the need to break the American field armies.