I think you are referring to a military exercise right after the visit of then U.S. House speaker Nancy Pelosi. It happened in August of last year. Yes, that military exercise was the biggest to date. The Chinese military exercise at that time was also different from other exercises they have conducted. The naval blockade was perhaps the most alarming at that time, because it was new.
However, in the time of a real war, a military blockade of Taiwan is perhaps not the most effective.... I've heard this from different sources. A blockade would give allies time to come and help Taiwan. If China's purpose is really to have a very quick war before the international community can come to Taiwan's rescue, a naval blockade is not going to work. Again, that is a technical part of military warfare.
As I said, in Taiwan we are hoping to get more international support. We call the diplomacy we have in Taiwan a preventive diplomacy. We want the whole world to come and let the Chinese know that whatever kind of invasion they have in mind, it will be just too costly for them to bear. We don't want a war to happen.