During the war period, Lucchese ends up suffering the umpteenth haemorrhage of players who leave to the front: relegation from B is inevitable, and it arrives in the 1941-1942 season with a lonely last place that seemes to close the happy parenthesis of the Thirties. 

The war was at home and even the championships comes to a stop. Italy is split in two: foreign troops stomp the ground and command in the North and in the South, the dramas of a civil war is added to those of a bloody and unsustainable conflict. 
We have to wait until the '44-'45 season to see timid signs of recovery through regional tournaments, but it is only at the end of the conflict, in the spring of '45 that we can go back and talk about football.

Lucchese starts again from Serie C thanks also to a renewed corporate structure with Antonio Fontana, unforgettable president, and immediately found promotion to Serie B. 
It wasn't enough yet: the fantastic double jump come the following year, in 1947, the “RossoNeri” put everyone behind them and find themselves in Serie A.  
Exalting the Porta Elisa crowd is first and foremost Danilo Michelini, at his second experience (as a native of Lucca) with the jersey of his city's team, which he will lead from serie C to serie A after having worn it in the 1930s. 
On the bench, there is another Lucchese legend: Aldo Olivieri, who achieves promotion with this jersey both as a player and as a coach, before moving on to Viareggio. In the top division, the “RossoNeri” are at ease.

The stadium is regularly full (the maximum attendance would be recorded for a Lucchese-Fiorentina match in '48 with 23,000 spectators with the “RossoNeri” first in the standings that humiliated the “Viola” - the Florence football team - with a dry score of 4-0), the team give everybody show and goals, first and foremost from Fabian and Conti.
At the end of that championship, Lucchese will be eighth, their best placing ever.
The “RossoNeri” make themselves feared on all football fields.