The +1 per HQ is not added in the assault on the city

[Andres71]

Late massive attack on Paris in the January/February 1941 turn. 5 HQs are attacking however the corresponding +1 per assaulting HQ is not added to the die roll modifier.

[Courtenay]

MWiF is correct.

City Modifiers (these can never sum to more than 0)
City -1
For each printed factory in hex being attacked -1
HQ attacking city +1
Per ENG factor attacking a city +1
Per ENG factor defending a city -1
(may be doubled by terrain)

It is not "per HQ attacking city +1". It is "HQ attacking city +1". Unlike the ENG bonuses, which are "per ENG factor", no matter how many HQs you have attacking a city, you only get one +1.

[Joseignacio]

I think he does not claim a +5 for 5 HQs, but he is looking for the +1 of one HQ attacking a city which he doesnt see in spite of having up to 5 HQs attacking. So he is claiming only a +1.

According to the info displayed it would be correct, because he would get:

-1 for City
-3 for 3 Factories
+2 for 2 Eng factors
+1 for one (or 5) HQs

-1 Total for Terrain and City

[Andres71]

MWiF is correct.

City Modifiers (these can never sum to more than 0)
City -1
For each printed factory in hex being attacked -1
HQ attacking city +1
Per ENG factor attacking a city +1
Per ENG factor defending a city -1
(may be doubled by terrain)

It is not "per HQ attacking city +1". It is "HQ attacking city +1". Unlike the ENG bonuses, which are "per ENG factor", no matter how many HQs you have attacking a city, you only get one +1.

You're right that fits, thank you.