Final answer:
General John C. Fremont likely exceeded the strict limits of his authority, as the context implies that President Lincoln's administration took extraconstitutional measures, which Congress considered beyond strict limits.
Step-by-step explanation:
Addressing the question of whether Union General John C. Fremont exceeded the strict limits of his authority, we must consider the context provided. Discontent revolved around President Lincoln and his administration taking extraconstitutional measures. The assertion that Congress found these actions outside of the constitutional purview supports the viewpoint that General Fremont could also have exceeded his given powers. Notably, it was President Lincoln who expanded the military forces and took actions deemed beyond presidential powers. It is implied that Fremont, as part of Lincoln's administration, was part of these actions which were considered extraconstitutional by Congress. Thus, based on the context, it may be indicated that Fremont exceeded strict limits of the act.