Gaining CP easily : specific fleet for Historical Battle.General
As topic mentioned, I want to share my experience on the Historical Battle, because you can exchange Gearing in shop by the point you collect, easier to upgrade to higher skill lever. I don't know whether Dev teams will add more powerful ships in Exchange, but more points in stock is still better. In both battles, you can obtain greatest point if you use ships below 3 stars, but in Denmark Strait, you can obtain points by using battleships only, in Narvik destroyers instead. So, to reach the highest C/P ,the best way is training six 3-star destroyers and battleships, unfortunately there are only four 3-star destroyers, so I choose to train 6 battleships. To pass the stage stably, I find that you need to upgrade all your ships to Rare level(and lv50 at least) and you can pass all stages in Denmark Strait and Narvik smoothly. If you only want to rush on the Denmark Strait (saving time), the requirements on ship may lower, uncommon is acceptable (but you may loss in last two battles). Picture below is my fleet, Colorado Freedom is optional, I recommend you to use Malaya, which has longer main fire range comparing to the König.