Arsene Wenger’s men became only the second team, after Bayer Leverkusen, to win at the Allianz Arena this season when they claimed a 2-0 victory in their Champions League last 16 tie.
The win came in vein as the Gunners exited the competition on away goals but Bould believes the side's performance in Germany, along with the North London derby against Tottenham, are two games that changed Arsenal’s season.
WENGER UNCONCERNED BY SZCZESNY SLUMP
Arsenal are 8/15 with bet365 to finish in the top four
“I think everybody has realised that clean sheets win games a lot of the time. We've improved.
“The big thing for us was getting that result at Bayern. I think we're more or less the only team that's won there this season so it just gives everybody a belief that we're doing alright. It was an important game for us.”
Much improved defensive displays have seen the Gunners concede only a solitary goal in their last three games, but Bould insists winning is the most important thing at this stage of the season.
He added: “If we win every game 3-2 from now until the end of the season, everybody is happy and delighted.
“We need to win games. That's the most important thing.”