The phrase "wert subject to" can be replaced with several synonyms, depending on the context of the sentence. Some alternatives include "were vulnerable to," "were prone to," "were liable to," and "were susceptible to." These synonyms suggest that there is a level of risk or exposure to something negative, such as harm or danger. Using these replacements can help vary your writing and avoid repetition in your word choice. However, it's crucial to choose the best synonym for the context to ensure the sentence conveys the intended meaning accurately.