Short answer. No. Article 1136 excludes wartime possession from your prescriptive period whenever the civil courts were not open during that time — that stretch simply does not count toward the years needed to acquire ownership or extinguish another's right by prescription, so only the time the courts were functioning counts.
What the law says
Possession in wartime, when the civil courts are not open, shall not be counted in favor of the adverse claimant.
Civil Code, Article 1136 — Possession in Wartime. Read the full provision →
Why the law excludes wartime possession
Prescription, whether used to acquire ownership of land or to bar someone else's claim through the passage of time, depends on possession running against an owner who had a real opportunity to go to court and stop it. Article 1136 recognizes that when the civil courts are not open, the true owner has no practical way to interrupt that possession through legal action, so the law refuses to credit the adverse claimant with time accumulated under those conditions. The rule protects the owner's inability to act, not the occupant's continued physical control of the land.
What counts as wartime possession under this rule
The article ties the exclusion to a factual condition — that the civil courts were not open — rather than to war in the abstract. If fighting occurred but the civil courts kept functioning and a suit could still be filed, the exclusion would not apply merely because the country was at war. Conversely, the disruption has to actually prevent access to the courts for the rule to operate; a general wartime atmosphere without an actual closure of the civil courts is not, by the text alone, enough to stop the clock.
How to compute your prescriptive period around it
Practically, this means splitting your total occupation into the time before the courts closed, the time they were closed, and the time after they reopened, and adding together only the first and third stretches. The period during which the civil courts were not open is simply excluded — not shortened, not counted at half value — from the years needed to complete whichever prescriptive period applies to your situation. Land occupied for what feels like a long, continuous stretch can still fall short of the required years once the wartime gap is removed from the count.
Whose favor the exclusion works against
Article 1136 says the excluded time is not counted in favor of the adverse claimant — the person relying on possession to defeat or acquire a right against someone else. It exists to protect the party who could not go to court to protect his property, by refusing to let the intervening years quietly ripen the occupant's claim. An occupant who wants credit for the full span of his possession has to show the years actually ran while the courts stood open to the true owner, not merely that he was physically present on the land.