Final answer:
The query regarding a 'definitive general plan by Louis de Soissons in the 1920s' does not correspond with a recognized historical plan or event. Clarification is needed to provide an accurate answer, as available references discuss other topics such as Soviet Five-Year Plans and European military strategies of the early 20th century.
Step-by-step explanation:
The term 'definitive general plan by Louis de Soissons' does not refer to a well-known historical event or plan, and hence does not align with any widely recognized 1920s plan or scheme. Instead, there might be confusion with architectural or urban development plans created by architects in that era, such as those by Le Corbusier.
Alternatively, referencing general strategic plans, the materials provided discuss different plans such as the Five-Year Plans which were economic goals set by the Soviet Union, or military strategies like the Schlieffen Plan by Germany prior to World War I, or France's Plan XVII.
It is important to cross-reference the details provided with the appropriate historical context to ensure a correct understanding of the 'general plan' in question. Without more specific information, it is difficult to provide a definitive answer regarding Louis de Soissons' plan from the 1920s.
One area of confusion could stem from conflating Louis de Soissons, potentially an individual involved in urban planning or architecture, with governmental economic strategies such as the Soviet Five-Year Plans, which aimed to rapidly industrialize the Soviet Union and increase agricultural output. These plans were highlighted by propaganda efforts that used slogans and imagery to motivate the populace.
However, this is clearly distinct from anything a single architect or planner like Louis de Soissons could have designed. To give accurate information, it would be necessary to correct the query with the proper historical figure or event.