Valaskjalv

I need some help in controlling my secondary guns manually. Currently running the Bismarck, my commander have enabled the Manual Fire Control for Secondary Armament. However, when I attack ships within the range of my secondary's they do not fire, even though I press CTRL left-click when aiming the ship. I have not disabled my secondary's by pressing P. What am I doing wrong?

Thank you for quick responding! I had clear view to the enemy, full broadside and he was clear within range of my secondary's. Just to make sure: I center the enemy in my binocular, press CTRL (the binocular view locks) and then left-click, right? Do I get any confirmation I have selected the enemy for my secondary's?